 WTB D Jet Cold Start Valve |
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| jack20 |
 Dec 19 2015, 01:01 AM
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#1
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Member  Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California 
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Hello,
Looking for a functional CSV/injector for my '74 2.0 d jet. Thanks, Jack |
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| kkid |
Dec 19 2015, 01:21 AM
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#2
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Member Group: Members Posts: 343 Joined: 18-December 07 From: Oakland, CA Member No.: 8,483 Region Association: Northern California |
QUOTE(jack20 @ Dec 18 2015, 11:01 PM)  Hello, Looking for a functional CSV/injector for my '74 2.0 d jet. Thanks, Jack Do you need a CSV in your area? |
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| jack20 |
Dec 19 2015, 01:35 AM
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#3
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Member Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California
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Great question. Car is very hard starting. I've read here that the cvs only operates in very cold temps.
Took it to a vw guy whose been in business for 40 years and he said not so. Said its regulated by the "thermo time switch" and works in moderate temps as well as cold. Is he wrong? |
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| BeatNavy |
Dec 19 2015, 05:17 AM
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#4
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region
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All references I've read suggests your guy is wrong (unless he considers below freezing "moderate" temps). I can also tell you I've tested a couple of TTS by putting them in the freezer. After taking them out of freezer and into room temperature environment they quickly "go off."
Copying and pasting directly from Anders' site (note temperatures at bottom). So unless you're starting in below freezing conditions (or colder), it's not really doing anything. The cold start valve provides a fine mist of fuel in the intake manifold to richen the mixture during cold starts. For most of us living in the continental US, the valve doesn't turn on except in the coldest months of the year. The valve is controlled by the thermo- or thermo-time switch and operates independently of the ECU. The valve is active only when the key is in the "start" position and the temperature is below the set point of the thermo-time switch. Actual measurements of the switching temperature of a sample thermo switch (311 906 161 C) indicate a lower temperature than quoted by the FWM, somewhere closer to 0 deg. C / 32 deg. F. Jeff Bowlsby found a reference (VWTG) that has a table of actuating temperatures for the early and later thermo switches, but not the thermo-time switch (note there is an error in the units conversion of the entry in the VWTG for first sensor listed below that has been corrected here): ◦311 906 161 : -12 to -18 deg. C / 10 to 0 deg. F ◦311 906 161 A : 0 to -10 deg. C / 32 to 14 deg. F ◦311 906 161 B : -2 to -8 deg. C / 28 to 18 deg. F ◦311 906 161 C : -6 to -14 deg. C / 21 to 7 deg. F |
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| cary |
Dec 19 2015, 07:32 AM
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#5
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest
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I agree with what Rob said above.
Do a search. I think it was Mark that just did a big write up. IIRC Mark's write says. The Thermo Time switch senses the ambient then determines whether to open the cold start valve. If it's needed, it sprays extra fuel only while the car is being started. Problem has been if the valve fails you begin run rich all the time. Quick check, take off the throttle body. If the plenum is wet with fuel the CSV is leaking. Quick fix. Take away the fuel. Unplug it. You don't need it. Plug the hose with a, IIRC 5mm bolt and clamp. I didn't even need them on kids car's in Montana. |
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| dlee6204 |
Dec 19 2015, 08:27 AM
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#6
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Howdy Group: Members Posts: 2,162 Joined: 30-April 06 From: Burnsville, NC Member No.: 5,956 |
VW also used other thermo-time switches that come on at more "moderate temps" like 75 or 90 F. These weren't used for 914s though.
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| jack20 |
Dec 19 2015, 07:38 PM
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#7
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Member Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California
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Thanks for saving me some grief and $$, guys.
Still looking for the cause of my cold starting woes... Jack |
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| dangrouche |
Dec 29 2015, 10:35 AM
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#8
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dangrouche Group: Members Posts: 550 Joined: 1-May 04 From: San Francisco Bay Area Member No.: 2,012 Region Association: None |
I live in SF Bay Area and disconnected the CSV years ago. Cold start woes..start with a tune up, then verify fuel pump pressure, then injectors spray flow.
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